Effects of the performance parameters of a wheelchair on the changes in the position of the centre of gravity of the human body in dynamic condition


Autoři: Bartosz Wieczorek aff001;  Mateusz Kukla aff001
Působiště autorů: Department of Basics Machine Design, Poznan University of Technology, Poznan, Poland aff001
Vyšlo v časopise: PLoS ONE 14(12)
Kategorie: Research Article
doi: 10.1371/journal.pone.0226013

Souhrn

Purpose

The aim of this research is to establish whether, and to what extent, the tilt angle, gear ratio of the propulsion system and propulsion frequency of a wheelchair influence the position of the centre of gravity. Furthermore, it verifies the usefulness of such research using an original test stand.

Materials and methods

The article presents the effects of three operational parameters of a wheelchair on the position of the centre of gravity of the human body. The study included 27 wheelchair propulsion tests of a wheelchair with pushrim propulsion using the following variable parameters: gear ratio of the propulsion system, propulsion frequency and wheelchair tilt angle. The position of the centre of gravity of the human body was measured in dynamic conditions at 100 Hz. The results were represented with ellipses defining the region of variability of the position of the centre of gravity of the human body. The coordinates of the centre of gravity were measured in relation to the reference system, with the start point at the centre of the axis of rotation of the rear wheelchair wheels. The measurements were taken in a horizontal plane in relation to the base on which the test stand was positioned.

Results

The research carried out shows that the inclination angle of the wheelchair has the greatest influence on position of the ellipse describing the position of the centre of gravity of the human body. By controlling the change in the inclination angle value in the range from 0° to 5.4°, the standard deviation of the length of the horizontal half-axis of the ellipse (SD a) equal to 31.2 mm was obtained. For comparison, by changing the frequency of pushes (40 to 50 pushes per minute) of the wheelchair at a constant inclination angle, the standard deviation of the horizontal half-axis length (SD a) equal to 8 mm was recorded. The results of the study show a change in the position of the centre of gravity of the human body in dynamic conditions. They are relative to the contact points of the wheelchair wheels with the ground. Using the dimensions of the plotted ellipses, one can determine the values of pressure that affect the wheelchair’s individual wheels. Conclusions–Increasing the value of each aforementioned parameter resulted in the increase of strength required by the operator to propel the wheelchair. It directly influenced the position of the centre of gravity during the test.

Klíčová slova:

Biological locomotion – Body limbs – Ellipses – Gears – Kinematics – Motion – Shoulders – Wheelchairs


Zdroje

1. Boninger ML, Cooper RA, Robertson RN, Shimada SD, et al. Three-dimensional pushrim forces during two speeds of wheelchair propulsion1. American journal of physical medicine & rehabilitation, 1997, 76.5: 420–426.

2. Boninger ML, Baldwin M, Cooper RA, Koontz A, Chan L, et al. Manual wheelchair pushrim biomechanics and axle position. Archives of physical medicine and rehabilitation, 2000, 81.5: 608–613. doi: 10.1016/s0003-9993(00)90043-1 10807100

3. Newsam CJ, Rao SS, Mulroy SJ, Gronley JK, Bontrager EL, Perry J, et al. Three dimensional upper extremity motion during manual wheelchair propulsion in men with different levels of spinal cord injury. Gait & posture, 1999, 10.3: 223–232.

4. Boninger ML, Souza AL, Cooper RA, Fitzgerald SG, Koontz AM, Fay BT, et al. Propulsion patterns and pushrim biomechanics in manual wheelchair propulsion. Archives of physical medicine and rehabilitation, 2002, 83.5: 718–723. doi: 10.1053/apmr.2002.32455 11994814

5. Koontz AM, Cooper RA, Boninger ML, Souza AL, Fay BT, et al. Shoulder kinematics and kinetics during two speeds of wheelchair propulsion. Journal of Rehabilitation Research and Development, 2002, 39.6: 635–650. 17943666

6. Brubaker CE, et al. Wheelchair prescription: an analysis of factors that affect mobility and performance. J Rehabil Res Dev, 1986, 23.4: 19–26. 3820118

7. Wieczorek B, Górecki J, Kukla M, Wojtokowiak D, et al. The analytical method of determining the center of gravity of a person propelling a manual wheelchair. Procedia Engineering, 2017, 177: 405–410.

8. Mulroy SJ, Gronley JK, Newsam CJ, Perry J, et al. Electromyographic activity of shoulder muscles during wheelchair propulsion by paraplegic persons. Archives of physical medicine and rehabilitation, 1996, 77.2: 187–193. doi: 10.1016/s0003-9993(96)90166-5 8607745

9. Niemeyer LO, Aronow HU, Kasman GS, et al. A pilot study to investigate shoulder muscle fatigue during a sustained isometric wheelchair-propulsion effort using surface EMG. American Journal of Occupational Therapy, 2004, 58.5: 587–593. doi: 10.5014/ajot.58.5.587 15481785

10. Kwarciak AM, Yarossi M, Ramanujam A, Dyson-Hudson TA, Sisto SA, et al. Evaluation of wheelchair tire rolling resistance using dynamometer-based coast-down tests. J Rehabil Res Dev, 2009, 46.7: 931–38. doi: 10.1682/jrrd.2008.10.0137 20104415

11. Van der Woude LHV, Geurts C, Winkelman H, Veeger HEJ, et al. Measurement of wheelchair rolling resistance with a handle bar push technique. Journal of medical engineering & technology, 2003, 27.6: 249–258.

12. Wieczorek B, Zabłocki M, 2016, „Multi-speed gear hub for manual wheelchairs,” original text in polish, patent no. PL 223142, Patent Office of the Republic of Poland

13. Zach W, Giesau A,1988, U.S. Patent No. 4,727,965. Washington, DC: U.S. Patent and Trademark Office.

14. Koontz AM, Cooper RA, Boninger ML, Souza AL, Fay BT, et al. Shoulder kinematics and kinetics during two speeds of wheelchair propulsion. Journal of Rehabilitation Research and Development, 2002, 39.6: 635–650. 17943666

15. Rodgers MM, Keyser RE, Gardner ER, Russell PJ, Gorman PH, et al. Influence of trunk flexion on biomechanics of wheelchair propulsion. Journal of rehabilitation research and development, 2000, 37.3: 283–296. 10917260

16. Kotajarvi BR, Sahick MB, An KN, Zhao KD, Kaufman KR, Basford JR, et al. The effect of seat position on wheelchair propulsion biomechanics. Journal of Rehabilitation Research & Development, 2004, 41.

17. Wieczorek B, Górecki J, Kukla M, Wojtkowiak D, Wilczyński D., 2018, „A device for simulating operating conditions and measuring dynamic parameters of a wheelchair,” original text in polish, patent applicaiton no. P.424482, patent Office of the Republic of Poland

18. Wieczorek B, Zabłocki M, 2016, „Multi-speed gear hub for manual wheelchairs,” original text in polish, patent no. PL 223142, Patent Office of the Republic of Poland

19. Robertson RN, Boninger ML, Cooper RA, Shimada SD, et al. Pushrim forces and joint kinetics during wheelchair propulsion. Archives of physical medicine and rehabilitation, 1996, 77.9: 856–864. doi: 10.1016/s0003-9993(96)90270-1 8822674

20. Koontz AM, Roche BM, Collinger JL, Cooper RA, Boninger ML, et al. Manual wheelchair propulsion patterns on natural surfaces during start-up propulsion. Archives of physical medicine and rehabilitation, 2009, 90.11: 1916–1923. doi: 10.1016/j.apmr.2009.05.022 19887217

21. Vanlandewijck YC, Spaepen AJ, Lysens RJ, et al. Wheelchair propulsion efficiency: movement pattern adaptations to speed changes. Medicine and Science in Sports and Exercise, 1994, 26.11: 1373–1381. 7837958

22. Kirby RL, Sampson MT, Thoren FA, MacLeod DA, et al. Wheelchair stability: effect of body position. J Rehabil Res Dev, 1995, 32.4: 367–72. 8770801

23. Marszałek J, Kosmol A, Mróz A, Wiszomirska I, Fiok K, Molik B, et al. Physiological parameters depending on two different types of manual wheelchair propulsion. Assistive Technology, 2018, 1–7.

24. Tomlinson JD, et al. Managing maneuverability and rear stability of adjustable manual wheelchairs: an update. Physical therapy, 2000, 80.9: 904–911. 10960938

25. Trudel G, Kirby RL, Ackroyd-Stolarz SA, Kirkland S, et al. Effects of rear-wheel camber on wheelchair stability. Archives of physical medicine and rehabilitation, 1997, 78.1: 78–81. doi: 10.1016/s0003-9993(97)90014-9 9014962

26. Lung C. W., Yang T. D., Crane B. A., Elliott J., Dicianno B. E. and Jan Y. K. Investigation of peak pressure index parameters for people with spinal cord injury using wheelchair tilt-in-space and recline: methodology and preliminary report. BioMed Research International, 2014, 1–9.


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2019 Číslo 12